A liquid drop colliding on the edge region of a heated plate at a temperature above the Leidenfrost temperature were investigated experimentally. To determine the edge region of a plate, it is not a matter as simple as comparing the size of the drop and the plate. The width of the edge region is largely determined by the tangential velocity component of the colliding drop. The collision processes near the edge of a plate were found to be drastically different from those far from the edge. Generally, a collision process far from the edge comprises simply the flattening, retracting, and reflecting of the colliding drop. A collision near the edge, however, involves more complicated processes. When the tangential velocity component of the drop is small, disintegration of the drop through reflection is weakened while drop splitting or deflection by the edge can be observed. When the tangential velocity component of the drop is large, drop splitting by the edge is lessened while the stretching-out separation of the flattened drop outside the edge greatly enhances the disintegration of the drop. Simple physical models are constructed to describe some of the collision processes.
Experiments in Fluids – Springer Journals
Published: Apr 12, 2009
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